Patent US4225686A successfully refreshed from Google Patents.
US4225686A
Expired / Lapsed
US
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Blends of copolyimides with copolyamideimides
Assignee: Dow Chemical Co
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Filing: 1979-07-19
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Granted: 1980-09-30
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Expires: 1999-07-19
Abstract
Abstract Novel polymer blends are disclosed comprising about 10 to 95 percent by weight of a copolyimide (A) prepared from benzophenone-3,3',4,4'-tetracarboxylic acid dianhydride and a mixture of 4,4'-methylenebis(phenyl isocyanate) and toluene diisocyanate (2,4- or 2,6-isomer or mixtures thereof) with the isocyanates used in a molar percent ratio from about 10/90 to 30/70 respectively; and from about 90 to 5 percent by weight of a copolyamideimide (B) prepared from 4,4'-methylenebis(phenyl isocyanate) and a mixture of trimellitic anhydride and isophthalic acid with the acid components used in a molar percent ratio from about 70/30 to 90/10 respectively. The novel blends may be used in the form of their dry blend or in solution and the films produced therefrom are characterized by improved elongation and tear strength values over those for the copolyimide (A) alone. Furthermore, the softening point of the blends is increased over the copolyamideimide alone.
Inventors
- 👤 Kemal B. Onder
- 👤 Frank P. Recchia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:13
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; Y; Y10; Y10S; Y10S525/00; Y10S525/928
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
111 words
A polymer blend comprising (A) from about 10 to about 95 percent by weight of a copolyimide having the recurring units ##STR10## wherein from about 10 to about 30 percent of said recurring units are those in which R represents ##STR11## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR12## and mixtures thereof; and (B) from about 90 percent to about 5 percent by weight of a copolyamideimide having from about 70 to about 90 percent of the recurring units of the formula ##STR13## and the remaining 30 to 10 percent of the recurring units of the formula ##STR14##
Claim 2
Dependent Claim
111 words
A polymer blend comprising (A) from about 10 to about 95 percent by weight of a copolyimide having the recurring units ##STR10## wherein from about 10 to about 30 percent of said recurring units are those in which R represents ##STR11## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR12## and mixtures thereof; and (B) from about 90 percent to about 5 percent by weight of a copolyamideimide having from about 70 to about 90 percent of the recurring units of the formula ##STR13## and the remaining 30 to 10 percent of the recurring units of the formula ##STR14##
Claim 3
Dependent Claim
48 words
A polymer blend according to claim 1 wherein said copolyimide (A) has about 20 percent of said recurring units in which R represents ##STR15## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR16## and mixtures thereof.
Claim 4
Dependent Claim
36 words
A polymer blend according to claim 1 wherein said copolyamideimide (B) has about 80 percent of the recurring units of the formula ##STR17## and the remaining 20 percent of the recurring units of the formula ##STR18##
Claim 5
Dependent Claim
37 words
A polymer blend according to claim 1 wherein said copolyimide (A) is present in about 50 to about 80 percent by weight and said copolyamideimide (B) is present in the remaining 50 to 20 percent by weight.
Claim 6
Dependent Claim
100 words
A polymer blend comprising (A) from about 50 to about 80 percent by weight of a copolyimide having the recurring units ##STR19## wherein about 20 percent of said recurring units are those in which R represents ##STR20## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR21## and mixtures thereof; and (B) from about 50 to about 20 percent by weight of a copolyamideimide having about 80 percent of the recurring units of the formula ##STR22## and the remaining 20 percent of the recurring units of the formula ##STR23##
Claim 7
Dependent Claim
100 words
A polymer blend comprising (A) from about 50 to about 80 percent by weight of a copolyimide having the recurring units ##STR19## wherein about 20 percent of said recurring units are those in which R represents ##STR20## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR21## and mixtures thereof; and (B) from about 50 to about 20 percent by weight of a copolyamideimide having about 80 percent of the recurring units of the formula ##STR22## and the remaining 20 percent of the recurring units of the formula ##STR23##
Claim 8
Dependent Claim
30 words
A polymer blend according to claim 5 wherein said copolyimide (A) is present in about 50 percent by weight and the copolyamideimide (B) is present in the remaining 50 percent.
Claim 9
Dependent Claim
120 words
A polymer solution comprised of a dipolar aprotic solvent and a solids content comprising (A) from about 10 to about 95 percent by weight of a copolyimide having the recurring units ##STR24## wherein from about 10 to about 30 percent of said recurring units are those in which R represents ##STR25## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR26## and mixtures thereof; and (B) from about 90 to about 5 percent by weight of a copolyamideimide having from about 70 to about 90 percent of the recurring units of the formula ##STR27## and the remaining 30 to 10 percent of the recurring units of the formula ##STR28##
Claim 10
Dependent Claim
120 words
A polymer solution comprised of a dipolar aprotic solvent and a solids content comprising (A) from about 10 to about 95 percent by weight of a copolyimide having the recurring units ##STR24## wherein from about 10 to about 30 percent of said recurring units are those in which R represents ##STR25## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR26## and mixtures thereof; and (B) from about 90 to about 5 percent by weight of a copolyamideimide having from about 70 to about 90 percent of the recurring units of the formula ##STR27## and the remaining 30 to 10 percent of the recurring units of the formula ##STR28##
Claim 11
Dependent Claim
77 words
A polymer solution according to claim 7 wherein said copolyimide (A) has about 20 percent of said recurring units in which R represents ##STR29## and the remainder of said units are those in which R represents a member selected from the group consisting of ##STR30## and mixtures threof; and said copolyamideimide (B) has about 80 percent of the recurring units of the formula ##STR31## and the remaining 20 percent of the recurring units of the formula ##STR32##
Claim 12
Dependent Claim
37 words
A polymer solution according to claim 8 wherein said copolyimide (A) is present in about 50 to about 80 percent by weight and said copolyamideimide (B) is present in the remaining 50 to 20 percent by weight.
Claim 13
Dependent Claim
21 words
A polymer solution according to claim 9 wherein said (A) and (B) are present in about 50/50 percent by weight proportions.
Claim 14
Dependent Claim
18 words
A film prepared from a polymer solution claimed in any one of claims 7, 8, 9 or 10.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |